## ✅ Cross-SDK Consistency Review

✅ Cross-SDK Consistency Review

I've reviewed PR #731 for cross-SDK consistency across all four language implementations (Node.js/TypeScript, Python, Go, and .NET).

Summary: Excellent consistency maintained ✨

This PR successfully adds the blob attachment type to all four SDKs with proper feature parity:

Type Definitions ✅

Node.js/TypeScript: Manual type added to MessageOptions.attachments union in nodejs/src/types.ts + generated types updated
Python: BlobAttachment TypedDict added to python/copilot/types.py and properly exported in __init__.py + generated types updated
Go: Uses generated Attachment struct from generated_session_events.go with Blob AttachmentType constant
.NET: UserMessageDataAttachmentsItemBlob class generated in dotnet/src/Generated/SessionEvents.cs

API Consistency ✅

All SDKs expose the same three required/optional fields with appropriate naming conventions:

Field	Node/Python	Go	.NET	Required
data	`data`	`Data`	`Data`	✅
mimeType	`mimeType`	`MIMEType`	`MimeType`	✅
displayName	`displayName`	`DisplayName`	`DisplayName`	Optional

Documentation ✅

Comprehensive examples added to all four language READMEs
Detailed feature documentation in docs/features/image-input.md with side-by-side examples
Updated docs/features/streaming-events.md to mention blob attachments
Test scenario documentation updated in test/scenarios/prompts/attachments/README.md

No consistency issues found 🎉

The implementation properly accounts for language idioms (camelCase in TS/Python dict keys, PascalCase in Go/C# public APIs) while maintaining semantic equivalence across all SDKs.

Generated by SDK Consistency Review Agent for issue #731 · ◷

Originally posted by @github-actions[bot] in #731 (comment)

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## ✅ Cross-SDK Consistency Review #894